// 16 x 16
const unsigned char air_filter_16x16[] PROGMEM = {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x1f, 0xfb, 0xdf, 0xfb, 0xdf,
  0xfb, 0x07, 0xfb, 0xdf, 0xfb, 0x87, 0xfb, 0x5f, 0xfb, 0x87, 0xfb, 0xdf,
  0xf8, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};